Crossbreed - no registry group (parent groups: Working) · Giant (115-202 lbs typical) · 7-10 years
Daniff
Typically friendly from the Great Dane side and courageous from the Mastiff - but a cross is an individual first: littermates can land at opposite ends of both parents. Meet the dog, not the label.
Crossbreed
115–202 lb
At a glance
Kid-friendly
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First-time owners
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Energy
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Shedding
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Good with cats
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Alone time
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Apartment OK
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Trainability
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Why it matters
Color & health
Daniffs can inherit color-linked health risks from either parent line. A cross does not dilute these — the gene is either there or it is not.
Merle pattern (from the Great Dane line)
Risk: Double merle (two copies) carries a high risk of deafness, blindness or both
A single merle Great Dane is a normal dog. The danger is breeding merle to merle, which produces on average one double merle in four puppies — typically mostly white, and at high risk of deafness and eye defects, because the gene suppresses the same pigment cells the inner ear and retina need to develop.
What to ask a breeder: Are BOTH parents DNA tested for merle? Cryptic merles look solid and carry the gene, so eyes are not enough. Never accept a litter from two merle parents.
Risk: Double merle (two copies) carries a high risk of deafness, blindness or both
A single merle Great Dane is a normal dog. The danger is breeding merle to merle, which produces on average one double merle in four puppies — typically mostly white, and at high risk of deafness and eye defects, because the gene suppresses the same pigment cells the inner ear and retina need to develop.
What to ask a breeder: Are BOTH parents DNA tested for merle? Cryptic merles look solid and carry the gene, so eyes are not enough. Never accept a litter from two merle parents.
Dilute colors — blue, silver, gray, fawn, lilac, isabella (from the Great Dane line)
Risk: Color dilution alopecia
The dilution gene clumps pigment in the hair shaft, weakening it until it breaks. Thinning usually starts between six months and three years, in the diluted areas only, with dry flaky skin and recurrent skin infections. It is managed, not cured.
What to ask a breeder: Ask whether either parent or any previous puppy has shown coat thinning. Be skeptical of a premium charged for a dilute color — the risk travels with it.
Risk: Color dilution alopecia
The dilution gene clumps pigment in the hair shaft, weakening it until it breaks. Thinning usually starts between six months and three years, in the diluted areas only, with dry flaky skin and recurrent skin infections. It is managed, not cured.
What to ask a breeder: Ask whether either parent or any previous puppy has shown coat thinning. Be skeptical of a premium charged for a dilute color — the risk travels with it.
On crosses: Merle marketed in a cross whose parents are not naturally merle means the pattern was introduced from somewhere else, and it brings the double merle risk with it. 'Merle doodles' are the common example.
Most color variation is exactly what it looks like — variety, and nothing more. Black, yellow and chocolate Labradors are equally healthy. Rough and smooth Collies differ only in coat. A Chihuahua's long and smooth coats are both standard. This section is about the specific cases where color and health are genuinely linked, not a suggestion that color usually matters.
What this is
A cross of: Great Dane × Mastiff (English Mastiff). A cross can inherit from either parent line — in temperament, coat and health. Read both parent breeds, and treat anything shared by both as the risk that matters most.
What this is
What they’re great at
✓ A natural with children - famously patient
✓ Willing, capable learner
✓ Handles alone time better than most breeds
✓ Devoted family loyalty - nothing gets past them
Why it matters
Honest challenges
Prey drive is hardwired
Small fast animals flip an ancient switch - this is wiring, not disobedience.
What helps: Management IS the training: never unsupervised with small pets, period. Secure fencing plus leash or long line outdoors for life. Feed the drive legally: flirt pole and lure-chase games.
Small fast animals flip an ancient switch - this is wiring, not disobedience.
What helps: Management IS the training: never unsupervised with small pets, period. Secure fencing plus leash or long line outdoors for life. Feed the drive legally: flirt pole and lure-chase games.
Selective about dog friends
Not every dog wants a hundred friends - this breed prefers a curated list.
What helps: Quality over quantity: a few calm, known companions beat any dog park. Parallel walks are the gold-standard introduction. Advocate for their space - declining strange dogs is good ownership.
Not every dog wants a hundred friends - this breed prefers a curated list.
What helps: Quality over quantity: a few calm, known companions beat any dog park. Parallel walks are the gold-standard introduction. Advocate for their space - declining strange dogs is good ownership.
Summer is dangerous, not just uncomfortable
Coat or airway makes heat a genuine physical limit.
What helps: Dawn and dusk walks; midday is rest time. Cooling mat, shade, and AC access always (see Home Setup). Learn the heatstroke signs in SOS - minutes matter.
Coat or airway makes heat a genuine physical limit.
What helps: Dawn and dusk walks; midday is rest time. Cooling mat, shade, and AC access always (see Home Setup). Learn the heatstroke signs in SOS - minutes matter.
Wariness of strangers is the factory setting
Centuries of guarding don't switch off for dinner parties.
What helps: Massive early neutrality socialization: calm around strangers, not friends with all. Door protocol: place command and managed greetings - no self-employment as bouncer. Never encourage 'protection' - confidence comes from training, not suspicion.
Centuries of guarding don't switch off for dinner parties.
What helps: Massive early neutrality socialization: calm around strangers, not friends with all. Door protocol: place command and managed greetings - no self-employment as bouncer. Never encourage 'protection' - confidence comes from training, not suspicion.
What you can do
Exercise & training
Exercise: Moderate - daily walks; avoid overexertion in puppies (from Great Dane) / Moderate - daily walks; avoid puppy overexertion (from Mastiff (English Mastiff)) - a cross can land at either end, or between.
Training profile — Guardian / mastiff / livestock guardian type: Bred to make independent decisions about threats. Your job is teaching them that YOU handle threat assessment. A professional trainer relationship from puppyhood is money well spent.
Sports and outlets that suit them: Rally · Leisurely walks · CGC
What you can do
Grooming & coat
Grooming: Low effort expected. The specifics depend entirely on which coat this individual inherited - see coat_and_grooming for the honest version, including matting risk and professional grooming budget.
Shedding: Moderate as a starting expectation - but shedding is one of the least predictable traits in a cross. See coat_and_grooming: a single litter can produce both a low-shed and a full-shedding coat, and no breeder can promise which you'll get.
Good to know
Health to know about
From the Great Dane line: Bloat (highest risk of any breed), dilated cardiomyopathy, osteosarcoma, hip dysplasia, wobbler syndrome | From the Mastiff (English Mastiff) line: Hip/elbow dysplasia, bloat, osteosarcoma, cardiac disease, cystinuria, short lifespan | SHARED BY BOTH LINES (not diluted by crossing): osteosarcoma
BOTH parent lines carry risk for: bloat, osteosarcoma. This is the important one to understand - crossing does NOT dilute a risk that both lines share, and 'hybrid vigor' does not apply here. Ask for testing on BOTH sides for these.
Breed-typical tendencies, not a diagnosis. Individual dogs vary enormously — your veterinarian screens for what matters for your dog.
How much should YOUR Daniff eat?
Open the appThis page can only give breed ranges. The app calculates calories and portions from your dog’s actual weight and life stage, splits them across the right number of meals, and adjusts as they grow.
Why it matters
Emergency red flags
Poisoning (chocolate, xylitol, grapes, medications, rodenticide)
Vomiting, drooling, tremors, collapse, or known ingestion
→ Call ASPCA Poison Control 888-426-4435 or Pet Poison Helpline 855-764-7661 immediately; do NOT induce vomiting unless instructed
Vomiting, drooling, tremors, collapse, or known ingestion
→ Call ASPCA Poison Control 888-426-4435 or Pet Poison Helpline 855-764-7661 immediately; do NOT induce vomiting unless instructed
Know your ER
→ Save your nearest 24-hour emergency vet's address and phone in your phone TODAY, not during a crisis
→ Save your nearest 24-hour emergency vet's address and phone in your phone TODAY, not during a crisis
BLOAT / GDV - the minutes-matter emergency for this breed
Unproductive retching (trying to vomit, nothing comes), rapidly swelling/hard belly, drooling, pacing, sudden distress after eating
→ Drive to the ER immediately. Do not wait to see if it passes. Untreated GDV is fatal within hours
Unproductive retching (trying to vomit, nothing comes), rapidly swelling/hard belly, drooling, pacing, sudden distress after eating
→ Drive to the ER immediately. Do not wait to see if it passes. Untreated GDV is fatal within hours
Heat stroke
Loud/frantic breathing, brick-red or blue gums, wobbliness, collapse, vomiting in heat
→ Move to AC, wet with cool (not ice) water especially belly/paws, fan, and drive to ER with windows down/AC on - even if the dog seems to recover
Loud/frantic breathing, brick-red or blue gums, wobbliness, collapse, vomiting in heat
→ Move to AC, wet with cool (not ice) water especially belly/paws, fan, and drive to ER with windows down/AC on - even if the dog seems to recover
Cardiac event (documented heart-disease breed)
Fainting/collapse during activity, night coughing, resting breathing rate over 30-35 breaths/min while asleep, blue-tinged gums
→ Sleeping respiratory rate over 30 warrants a call today; collapse or labored breathing means ER immediately
Fainting/collapse during activity, night coughing, resting breathing rate over 30-35 breaths/min while asleep, blue-tinged gums
→ Sleeping respiratory rate over 30 warrants a call today; collapse or labored breathing means ER immediately
Urinary blockage
Straining with little or no urine produced, crying in the litter posture, vomiting, hard painful belly
→ This is a life-threatening emergency, especially in males - ER immediately
Straining with little or no urine produced, crying in the litter posture, vomiting, hard painful belly
→ This is a life-threatening emergency, especially in males - ER immediately
This page never carries product links in the emergency section. ASPCA Poison Control (888) 426-4435 · Pet Poison Helpline (855) 764-7661.
These need to work when the signal does not
Get it on your phoneThe app keeps every Daniff red flag on your phone and opens them with no connection at all — which is the whole point at 2am in a car park. Add it to your home screen and it works like any other app.
📊 The numbers›
Typical ranges for planning, not promises — costs vary by region, breeder and individual dog.
| Group | Crossbreed - no registry group (parent groups: Working) |
| Size | Giant (115-202 lbs typical) |
| Lifespan | 7-10 years |
| Healthy adult weight | 115–202 lb |
| Original purpose | Bred as a companion cross, not for a working role. The instincts still arrive from both sides - Great Dane: Hunting wild boar; estate guarding. | Mastiff (English Mastiff): Estate guardian and war dog. |
| Monthly care | $150-$300 (estimated range across both parent lines) |
| Typical puppy price | $1,000-$3,500 (spans both parent breeds; reputable cross breeders should still health-test BOTH lines) |
Got a Daniff?
Open the app
Add them in the app for feeding by weight, training for their stage, and Daniff emergency red flags saved to your phone. Free, no account needed.
Bring your Daniff in
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